Saw sharpening machine



Jan'. 19, 1954 L. BRQWN 2,66,34s

' SAW SHARPEING MACHINE Filed July 2, 194s u 4 sheets-sheet 1 @www A Ito rneyx Jan. 19, 1954 1 BROWN SAW SHARPENING MACHINE Filed July 2, 1948 4 Sheets-Sheet 2 INVENTOR. UTE BROWN ATTORNEYS Jan. 19, 1954 L. BROWN SAW SHARPENING MACHINE Filed July 2, 1948 4 Sheets-Sheet 3 [uref/lor UTE B00 W /V Jan. 19, 1954k L, BROWN 2,666,346

SAW SHARPENING MACHINE Filed July 2, 1948 4 Sheets-Sheet 4 Atto rneys Patented Jan. 19, 1954 UNITED star s Param oFFIcE 1 Chim. 1

The present invention relates to a saw sharpening machine and it consists in the combinations, constructions and arrangements of parts herein described and claimed.

It is an object of the present invention to pro--l vide a saw sharpening machine in which the sharpening means is adjustable with regard to the pitch, bevel and incline of the teeth of a saw.

Another object of the invention is the provision of a saw sharpening machine wherein a high speed grinding Wheel is employed as the sharpening medium.

Another object of the invention is the provif sion of a saw sharpening machine which is simple in construction, quickly and 'easily adjustable and rapid, accurate and economical in its operation.

A further object of the invention is the provision of novel means for the accurate adjustment and positioning of a -grinding Wheel with respect to a saw in a saw sharpening machine.

A still further object of the invention is the provision of novel reversing mechanism in a saw sharpening machine.

Other and further objects of the invention will become apparent from a reading of the following specication taken in conjunction with the drawings, in which:

Figure 1 is a plan view of an embodiment of the invention,

Figure 2 is a side elevational view, partly in section, of Figure 1,

Figure 3 is a front elevational View of the apparatus,

Figure 4 is an end elevational view taken in a direction opposite to that of Figure 2,

Figure 5 is a sectional view taken along line 5 5 of Figure 2,

Figure 6 is a fragmentary sectional View taken along line 6-6 of Figure 4,

Figure 7 is a sectional view taken along line I--1 of Figure 1,

Figure 8 is a sectional view taken along line 8-8 of Figure 1, and/or line 8 8 of Figure 7,

Figure 9 is a sectional View taken along line 9 9 of Figure '7,

Figure 10 is a view similar to Figure 9 but with certain parts advanced due to the operation of the apparatus,

Figure 11 is a sectional view taken along line II-II of Figure 10,

Figure 12 is a fragmentaryvplan View, partly broken away, of a portion of the apparatus,

Figure 13 is Ia sectional view taken along line I3--I3 of Figure 11, Y

Figure 14 is a sectional view taken along line l-I of Figure 13,

Figure 15 is a sectional view taken along line I5-I 5 of Figure 14,

Figure 16 is a sectional view taken along line Iii-I6 of Figure 8, and

Figure 17 is a sectional View taken along line II-I 1 of Figure 4.

Generally, there is provided a saW sharpening machine in which a saw is clamped t0 a housing which is provided with a hinged platform having a motor and sharpening apparatus thereon. The sharpening apparatus is unique in the provision of novel means for adjusting to exact measured position of a grinding element adapted to be driven by the motor which also, through novel apparatus, raises and lowers the platform and thereby the grinding element from ycontact with the saw at the same time advancing the' saw blade a sucient distance to be positioned for the next tooth thereof to be ground. A novel reversing mechanism is also provided.

Referring now more particularly to the drawings, there is shown therein a saw sharpening machine adapted to be mounted upon a work table I0 or the like and comprising a casing II having a platform l2 hinged at its rear edge as indicated at I3 to the rear wall of the casing.

Mounted upon the platform I2 is a motor I4 having a drive shaft I5 provided with a worm I6 which is enmeshed With a worm gear II which is carried at the upper end of a vertical shaft I8, the lower end of which is provided with a bevel gear I9 which is enmeshed with a bevel gear 20 mounted at one end of a horizontal shaft 2I carried by hangers 22 affixed to the underside of the platform I2. The opposite end of the shaft 2| is provided with a crank 23 having a pin 24 revolubly mounted in the upper end of an arm 25 the lower end of which isprovided with a pin 26 pivotally mounted in a standard 21 aflixed to the table I Il.

A saw carriage 28 is transversely and slidably mounted upon a bar 2S at the front edge of the. table I0 and has aixed thereon a plate 36 which is provided with an upstanding dog 3| to which is pivoted an arm 32 havinga half nut 33 at its outer end.

The half nut is adapted to engage threads 34 formed upon a shaft 35, the threaded portion of which is journaled in uprights 36 and 37 attached to the table IEl. The shaft protrudes through the upright 3'! and extends to an upright 38 in which it is also journaled. Between the uprights 3l and 38, the shaft 35 has reciprocally mounted upon it a hollow shaft 39 which is keyed to the shaft 35, as indicated at 40 and which is provided with a bevel gear 4l at its other end. Centrally of the hollow shaft 39 there is provided a pair of annular flanges 42 between which the opposite sides of an open portion 43 of a reversing lever 44 are adapted to be. The lever 44 is pivoted to a dog 45 affixed to the table lll .and is provided with an operating handle 45 at its upper end.

A pair of standards 41 mounted upon the table l have transversely mounted at their upper end a shaft 48 which extends forwardly and is pro,- vided with a bevel gear 49 at its forward end. Integrally formed upon the rear face of the gear 49 is a circular ratchet 50. A spacing member surrounds the shaft 48 between the standards 41. The bevel gear 49 is adaptedto engage eitherV the gear 40 or the gear 4|.

To the underside of the platform l2 is affixed a detent 52 which is adapted to engage the under--V side of one arm of a bell-crank lever 53 which is pivoted, as indicated at 5d, to a support 55 which' is affixed to the table l and which has its other arm pivotally connected, as shown at 56lto a shaft 51 recipro'ca'lly` mounted in a supa port 58 and which terminatesin a pawl 58 adaptn ed to engage with the ratchet 50.' A spring titl interconnects the pawl 59 andthe table. It).

The saw carriage is provi-ded withV a pair of vclamping membersl each provided with thumb screws 62` for tightening the same and adapted to hold a saw 63 having teeth 64 in position for sharpening.

The platform I2V is provided with an arcuate slot 65 over which is positioned a slidably mount ed base (i6. having an arcuate groove 51 formed in'its underside and adapted to register with an arcuate raised portion S8 in the platform l2. An axle 69,-is heldin position upon the base Sie by means of a clamp adapted to be tightened by means of a pair of thumb screws 1l for bolts 12 the lower ends of vwhich protrude through the slot -65 andfengage the underside of the platform lI2.

A rear clamp 13- also engages the axle 69 and 1 is adapted to-be tightened by a pair'of bolts 14 attachedto the base 'and'having thumb screws adapted to bear against bolt collars 1t formed integrally with-the clamp 13;

A vertically extendingv protractor 15 is aflxed 1 tothe base 66- and is provided with indicia 11 adjacent its arcuate edge.

A forwardly extending semi-circular control arm 18 is integrally formed with the axle 59 and is provided with a pointer 19-at its rear side, the pointer being adapted to register with the indicia 11.

A-plate 3|]` is slidably mounted upon the control arm18 and may be clamped in selected positions thereon by means of a clamp arm 8|, such positions being determined by means of indicia 82 on the arm 18.

Protruding through the upper'end of the plate 80 is a shaftBS lcarrying a pulley 84 atone end and having its other end interconnected with the shaft l5 by means of a flexible shafting 35 which may be supported by alooped wire member 8d affixed in a block 81 at one side of the casing l. A belt 88 interconnects the pulley 84 with a pulley 89 carried at one end of a shaft 9|! mounted in the lower end of the plate 80.

To the other end of the shaft Qt there is afhxed a grinding wheel 9|. The forward end of the axle 69 is provided with a pointer 92v which is adapted to register with `indicia 93 upon a pro- 4 tractor 94 which is adapted to lie flat upon the platform I2 and abut the saw B3.

In operation, it will be seen that a saw 53 is first placed in position upon the saw carriage 28 by clamping the same with the clamps 5|. Thereupon, the particular angle or degree of bevel to be ground into the teeth 64 of the saw 63 may be regulated by the position of the plate 66 as it may be positioned by means ofthe clamp 1i? and the thumb screws 1| within the slot S5. The degree of incline in the cut of the saw teeth 64 may be regulated by the particular position of the plate 80 upon the arm 18 with respect to the particular indicia S2 thereon. With regard to the degree of pitch, this may be regulated by the particular positioning of the control arm 18 with respect to the protractor 15a, as indicated by the pointer 19 carried by the arm 18. The particular position of the arm 18 with respect to the protractor 16a may be easily regulated by means of the clamps 16 and 13.

It will also be seen that when the apparatus is in motion that the platform l2 will be alter nately lifted and allowed to reassume its normal position by means of the shaft 2l operating through the crankV 23 and the arm 25 which cooperate to force theshaft 2| to raise the platform l2 through the medium ofV brackets 22 thereby causing the platform' l2 and all of its attendant parts to be lifted and redeposited as power is transferred from the motor it to the shaft 2 I. In the interim, it will be apparent that one or the ,other of the bevel gears itil or ii will be in contact with the bevel gear llt as controlled by the reversing lever e4. Since the hollow shaft 39 is keyed to the shaft 35, the shaft 35 and its threaded portion 34 will be turned in a clockwise or counter-clockwise direction by the alternate lifting and dropping of the platform |2 and the consequent movement of the bell-- crank 53 by the detent 52 and the movement of the pawl 59 in the ratchet 139. Such action will cause the-half nut 33 to move along the threaded portion 34 of the shaft 35 and thusmove the saw 53 during the'period when the grinding wheel 9| is lifted away from the teeth While but one form of the invention has been shown and described herein, it will be readily apparent to those skilled in the art that many minor modications may be made without departing from the spirit of the invention or the scope of the appended claim.

What is claimedV is:

A saw Sharpener comprising a table, a casing mounted on said table, a platform hinged at its rear end to the rearA of a transversely slide-ble saw carriage mounted upon the forward end of the table adjacent the forward end ol' said platform,y clam s carried by said carriage for holding a saw with its teeth uppermost and in horizontal alignment, a plate positioned upon said platform, said platform having an arcuate slot therein, said slot being centered upon said saw, a pair of thumb screws extending through said plate and said slot, a horizontal axle clamped atop said plate and extending at right angles toward said saw, a semi-circular control arm having one end affixed to said axle, a vertically extending preti-actor aiiixed to said plate in parallelism-with said saw, a pointer anixed to Said axle and adapted to register with said vertical protractor, a support plate adjustably and slidably clamped uponsaid control arm and extending said control arm, a grinding wheelmounted upon 5 the lower portion of said support plate and extending generally in a plane parallel to the plane of the support plate. said wheel having that portion of its outer edge most remote from said support plate lying in the path of movement of said saw teeth, means for moving said grinding Wheel into and out of engagement with the teeth of said saw, and means for moving said carriage when said grinding Wheel is out of engagement with said saw, said means for moving said grinding wheel into and out of engagement with said saw including a vertical shaft driven by said motor and extending through said platform, a horizontal shaft operatively connected at one end to said vertical shaft and revolubly mounted on the underside of said platform, a crank mounted upon the other end of said horizontal shaft, a pin extending laterally from the free end of said crank, a standard afxed to the table,

a pin extending laterally from the upper end of said standard, and a link interconnecting said pins.

LUTE BROWN.

References Cited in the iile of this patent UNITED STATES yPATENTS Number Name Date 261,624 Olney July 25, 1882 545,064 Fleck Aug. 27, 1895 1,557,494 Glang Oct. 13, 1925 1,952,323 Litomy Mar. 27, 1934 2,334,136 Underwood Nov. 9, 1943 2,343,171 Collier Feb. 29, 1944 2,462,225 Roderick Feb.v 22, 1949 2,470,290 Chryst May 17, 1949 2,507,371 Eklund May 9, 1950 

